Assuming this question doesn't contain an "if she asked you to", I'm pretty sure that most girls would be pretty terrified if you intentionally followed them into a secluded place, especially if your only reasoning for doing so is that you find them attractive.

So, yeah, the options are don't follow her, or follow her and terrify her, therefore meaning you aren't likely to get whatever it was you wanted anyway... I'd go with the first. Better to just get nothing than to get a reputation as a creepy stalker.

I'd take a look at her if I just went hiking, exploring and bushcrafting, but I'd also be curious about why she's alone. Could she be trusted? I'd have to find out. Maybe I could ask her why she's all alone in the woods and if she knows her way out. Also, I would be peaceful with the person, but defensive if anything bad were to occur . I'm still wondering why an attractive, young girl would be all alone in a forest. Perhaps she could be explorer, hiker, hunter or a seemingly lost person trying to find her way back home . Got nothing graphical to say about this. Do I have a feeling that the OP could have explained a little more about this situation about girls in the woods and being followed or not?